Guidelines for engineering reports for water projects

GUIDELINES FOR
ENGINEERING REPORTS
FOR
WATER PROJECTS
ENDORSED BY:
OKLAHOMA WATER RESOURCES BOARD
OKLAHOMA DEPARTMENT OF COMMERCE
OKLAHOMA CITY AREA INDIAN HEALTH SERVICE
USDA - RURAL DEVELOPMENT - OKLAHOMA
OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY
Revised: May 12, 2011 Revised: 05/12/2011 Engineering Report Guidelines/Water Page 1
CONTENTS
ENGINEERING REPORT
Water Projects
I. Project Planning Area
A.
Location, maps, photographs, & sketches .................................................. Page 3
B.
Design Period ....................................................................................................... 3
C.
Growth areas and population trends .................................................................... 3
D.
Current and projected water use data ................................................................. 3
E.
Environmental concerns in service area .............................................................. 3
II. Existing Facilities and Need for Project
A. Location and layout ............................................................................................. 3
B. Condition of existing facilities ............................................................................... 3
C. Health and safety ................................................................................................ 3
D. System O&M ....................................................................................................... 4
E. Growth capacity ................................................................................................... 4
F. Sewage system availability .................................................................................. 4
III. Alternatives Considered
A. Description ........................................................................................................... 4
B. Design criteria ...................................................................................................... 4
C. Environmental Impacts ........................................................................................ 4
D. Land requirements .............................................................................................. 5
E. Construction problems ......................................................................................... 5
F. Cost estimates ..................................................................................................... 5
G. Advantages/Disadvantages ................................................................................. 5
IV. Proposed Project Design and Cost Estimate (Recommended Alternative)
A.
Source(s) of water supply .................................................................................... 5
B.
Water rights ......................................................................................................... 6
C.
Treatment ............................................................................................................ 7
D.
Storage ................................................................................................................ 7
E.
Pumping stations ................................................................................................. 7
F.
Distribution layout ................................................................................................ 7
G.
Hydraulic calculations .......................................................................................... 7
H.
Waste disposal .................................................................................................... 7
I.
Green project reserve components ..................................................................... 8
J.
Recommended alternative cost estimate ............................................................. 8
V. Financial status .......................................................................................................... 8
VI. Conclusions and Recommendations ......................................................................... 8
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 2
CONTENTS (continued)
ENGINEERING REPORT
Water Projects
Appendices
Appendix A Population Projections
Appendix B Water Use Projections
Appendix C Table of Design Capacity
Appendix D Calculation of Capacity of Disinfection Process
Appendix E Cost Effective Present-Worth Analysis Format
Appendix F Water Rights Request Form
Appendix G Green Project Reserve ComponentsRevised: 05/12/2011 Engineering Report Guidelines/Water Page 3
ENGINEERING REPORT
Water Projects
I.
PROJECT PLANNING AREA. Describe the area under consideration. The project planning area may be larger than the service area determined to be economically feasible. The description should include information on the following:
A.
Location, maps, photographs, and sketches. These materials should indicate legal and natural boundaries, major obstacles, elevations, etc.
B.
Design Period. Define the design period of the project.
C.
Growth areas and population trends. Specific areas of concentrated growth should be identified. Population projections for the project planning area and concentrated growth areas should be provided for the project design period. These projections should be based on historical records with justification from recognized sources such as U.S. Census Bureau and Department of Commerce. If additional sources are utilized, provide additional documentation and justification. (See example table in Appendix A.) Include a description of population trends as indicated by available records, and the estimated population that will be served by the proposed water supply system or expanded system.
C.
Current and projected water use data. For existing systems, the current water use data should be used as a basis for the proposed design. If a deviation is deemed necessary, a justification must be provided. Present water consumption and the projected average maximum daily demands, and peak hourly flow shall be used as the basis of design. (See example table in Appendix B.)
D.
Environmental concerns in the service area. Discuss all the environmental concerns or effects within the service area that must be considered in project planning.
II. EXISTING FACILITIES AND NEED FOR PROJECT. Describe the existing facilities including at least the following information:
A. Location and layout. Provide a site plan and schematic layout for treatment facilities.
B. Condition of existing facilities. Describe present condition, suitability for continued use, adequacy of water supply, existing water source quantity (yield or specific capacity) and quality. Describe compliance with all state and federal requirements for water supply systems including primary and secondary drinking water standards, and National Pollutant Discharge Elimination System permits. Discuss the wastes generated by existing water treatment processes, their volume, treatment, and points of discharge or method of disposal. Provide table showing the design capacity for each existing facility component based on ODEQ Revised: 05/12/2011 Engineering Report Guidelines/Water Page 4
construction standards (OAC 252:626). (See example tables in Appendix C and D.)
C. Health and safety. Describe concerns and include relevant regulations and correspondence from/to Federal and State regulatory agencies such as ODEQ inspection reports, Notices of Violation, and Consent or Administrative Orders. Also, describe compliance with all state and federal requirements for water supply systems pertaining to handicap accessibility standards for public areas such as the office, and security standards for protection of all drinking water facilities. This section should also discuss any improvements necessary to provide enhanced security at source or treatment facilities and improved handicap accessibility in public use areas as required by the Americans with Disabilities Act.
D. System O&M. Describe the concerns and indicate those with the greatest impact. Investigate water loss, management adequacy, inefficient designs, outdated facilities and problem elimination prior to adding additional capacity.
E. Growth capacity. Describe the reasonable growth capacity that is necessary to meet needs during the planning period. Facilities proposed to be constructed to meet future growth needs should generally be supported by additional revenues. Consideration should be given to designing for phased capacity increases. Provide number of new customers committed to this project.
F. Sewage system availability. Describe the existing sewage system, sewage treatment works, and water treatment plant sewage system for both treatment and sanitary wastes. For new water systems or water distribution extension projects, describe the existing or proposed sewage system for the new service area. Water treatment plant engineering reports must provide an approvable sewage disposal system. Discuss proper separation of water and sewage facilities.
III. ALTERNATIVES CONSIDERED. This section should contain a description of the reasonable alternatives, including the do-nothing alternative wherever applicable, that were considered in planning a solution to meet the identified need. The description should include the following information on each alternative:
A. Description. Describe the facilities associated with the alternative. Describe all feasible water supply sources and provide comparison of such sources. Also, describe treatment, storage, pumping, distribution facilities, discharge point and receiving water body, as applicable.
B. Design criteria. State the design parameters used for evaluation purposes at average daily flow, max daily flow and peak hourly flow. Also, include parameters such as contact time, detention time, size of units.
C.
Environmental impacts. Provide a short description of environmental impacts Revised: 05/12/2011 Engineering Report Guidelines/Water Page 5
that may preclude any alternatives. Only projects that will utilize funds that have a federal identity require the completion of an Environmental Information Document (EID). Those current funding sources would be as follows:
1. Rural Development Loan and Grant Programs for Water and Wastewater
2. Department of Commerce Community Development Block Grants
3. OWRB-ODEQ State Revolving Loan Funds
4. Oklahoma City Area Indian Health Service
D.
Land requirements. Identify sites, rights-of-way and easements required. Further specify whether these properties are currently owned, to be acquired or leased.
E.
Construction problems. Discuss concerns such as subsurface rock, unsuitable materials, high water table, limited access, flood plain areas, or other conditions which may affect cost of construction or operation of facility.
F.
Cost estimates.
1.
Construction.
2. Non-construction and other projects costs such as land, professional fees, testing, surveying, etc.
3. Annual operation and maintenance.
4. Cost effective present worth analysis. See a sample format in Appendix E.
G. Advantages/Disadvantages. Describe the specific alternative’s ability to meet the owner's needs within its financial and operational resources, comply with regulatory requirements, compatibility with existing comprehensive area-wide development plans, and satisfy public and environmental concerns.
IV. PROPOSED PROJECT DESIGN AND COST ESTIMATE (RECOMMENDED ALTERNATIVE). This section should contain a fully developed description of the proposed project based on the preliminary description under the evaluation of alternatives. At least the following information should be included:
A.
Source(s) of water supply. The applicant should describe the proposed source or sources of water supply to be developed, the reasons for their selection, and provide the following information:
1.
For surface water sources, include:
a.
hydrologic data, stream flow and weather records.
b.
safe yield, quantity, including all factors that may affect it.
c.
maximum flood or pool elevation.
d.
description of the watershed, noting any existing or potential sources of contamination which may affect water quality.
e.
summary of the quality of raw water with special reference to fluctuations in quality. Revised: 05/12/2011 Engineering Report Guidelines/Water Page 6
2.
For ground water sources, include:
a.
sites considered.
b.
advantages of the site selected.
c.
elevations with respect to surroundings and floodplain(s).
d.
character of formations through which the source is to be developed.
e.
geologic conditions affecting the site.
f.
summary of source exploration, test well depth, and method of construction; placement of liners or screen; test pumping rates and their duration; water levels and specific capacity, chemical and radiological quality of the water.
g.
all sources of possible contamination including but not limited to sewers and sewerage facilities, landfills, outcroppings of consolidated water bearing formations, waste disposal wells, slush pits, irrigation wells, and abandoned wells.
h.
industrial and other private supply. Where pertinent, use significant groundwater developments within a one mile (1.6 kilometer) radius of the proposed groundwater source, giving depths, size, protective casing depth, capacity, location, type and any available information pertaining thereto.
3.
For purchased water systems, include:
a.
Quantity available from source water systems.
b.
Quality of source water system.
c.
Copy of the Purchase Water Contract
B.
Water rights. Existing and proposed (Discuss the status of any water rights acquisition(s)). Send water rights inquiry form to appropriate agency. (See Appendix F for form.) Verify that the amount of water rights held is sufficient to supply enough water for current and possible future use.
1.
Verification that the water rights held at the Oklahoma Water Resources Board are in good standing and not subject to cancellation or reduction. This verification may be obtained by contacting the Permitting Section of the Oklahoma Water Resources Board. Verify that all wells and/or diversion points being utilized are authorized under water rights held at the Oklahoma Water Resources Board. Verification shall include the submittal of the GPS locations or land survey of all wells and/or diversion point locations along with the legal location of each down to a 10-acre tract. Verification form must be submitted certifying that the locations have been compared with the legal locations authorized under such water rights and that all wells and/or diversion points being utilized are authorized under the permits held at the Oklahoma Water Resources Board. Any new wells and/or diversion points being proposed must be permitted by the Oklahoma Water Resources Board (process for permitting may take as little as three months if application is not protested and up to a year or longer if protested). Revised: 05/12/2011 Engineering Report Guidelines/Water Page 7
2.
If the authorized raw water use is or will be from an Army Corps of Engineers reservoir, verification that the water storage contract with the Army Corps of Engineers provides adequate storage for the term of the loan of the appropriate funding agency.
3.
If the authorized raw water use is or will be from a Grand River Dam Authority reservoir, verification that the raw water supply contract with the Grand River Dam Authority provides adequate storage for the term of the loan of the appropriate funding agency.
C.
Treatment. Describe process in detail including a plan view and schematic of site layout, and identify location of plant and site of any process discharges. Also describe foundation conditions and floodplain elevations at sites of proposed structure based on geotechnical information, and approximate elevation of groundwater in relation to subsurface structures. Provide a hydraulic profile of treatment facilities. In a table, show the design capacity for each existing unit, proposed unit, ODEQ required capacity (OAC 252:626), and indicate if plant design meets ODEQ requirement. See appendices C and D for example tables of plant design and disinfection process capacity. Provide a description of how water treatment plant sludge is or will be managed and a status of an ODEQ approved sludge management plan. Provide a description of back-up and/or alternate power supply.
D.
Storage. Identify size, type and site location. Discuss hydraulic interactions with existing facilities. Also describe foundation conditions and floodplain elevations at sites of proposed structure based on geotechnical information, and approximate elevation of groundwater in relation to subsurface structures.
E.
Pumping stations. Identify size, type, site location and any special power requirements.
F.
Distribution layout. Identify general location of line improvements: lengths, sizes and key components, and the character of the soil through which water mains are to be installed including NRCS soil maps and descriptions.
G.
Hydraulic calculations. This information should provide sufficient detail in a tabular format to determine compliance with ODEQ design requirements. Automation tools may be used by the engineer. The submittal should include a map with a list of nodes and pipes and the associated characteristics, such as elevation of node, pipe diameter, pipe segment length, reservoir elevation, domestic and industrial peak water demands, pressures, fire flow, etc. Describe fire flows which will be made available by the proposed or enlarged system. Requirements of the Insurance Services Office or other similar agency as to the fire flows required or recommended in the service area involved.
H.
Waste disposal. Discuss the various wastes including residuals from the water treatment plant, their volume, proposed treatment, points of discharge, discharge Revised: 05/12/2011 Engineering Report Guidelines/Water Page 8
permit required and/or method of disposal. A ODEQ approved residuals management plan will be required with construction permit. Project sites shall include the following:
1.
Discussion of the various sites considered and advantages of the recommended ones.
2.
The proximity of residences, industries, and other establishments.
3.
Any potential sources of pollution that may influence the quality of the supply or interfere with effective operation of the water works system, including but not limited to: absorption systems, septic tanks, privies, cesspools, sink holes, sanitary landfills, refuse and garbage dumps.
4.
Provide geotechnical results for lagoons.
I.
Green project reserve components (for SRF Projects Only). Identify and discuss any components of the proposed project that may qualify as “green” based on the guideline in Appendix G. Complete and attach the GPR check sheet as an appendix to the Engineering Report.
J.
Recommended Alternative Cost Estimate. Provide an itemized cost estimate for the proposed project based upon anticipated period of construction (For projects containing both water and waste disposal systems, provide a separate cost estimate for each system.)
1.
Development costs.
2.
Construction costs.
3.
Land and rights.
4.
Legal fees.
5.
Engineering fees.
6.
Inspection fees.
7.
Interest.
8.
Contingency.
9.
Refinancing.
10.
Other costs associated with the proposed project.
V. Financial status. Provide information regarding:
A.
The current and proposed or projected rate schedules.
B.
Annual operating and maintenance (O&M) cost (existing and proposed).
C.
Tabulation of users by monthly usage categories.
D.
Revenue received for the last three fiscal years.
E.
Give status of existing debts and required reserve accounts.
F.
Prepare a schedule of short-lived assets and a recommended annual reserve deposit to fund replacement of short-lived assets such as pumps, paint, and small equipment. Short-lived assets include those items not covered under O&M, however, this does not include long-lived assets such as water tank or treatment facility replacement that should be funded with long-term financing.
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 9
VI. Conclusions and Recommendations. Provide any additional findings and recommendations that should be considered in development of the project. This may include recommendations for special studies; highlight the need for special coordination, a recommended plan of action to expedite project development, etc. Provide a schedule for the project planning and construction.
END OF GUIDELINES
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 10
APPENDIX A
Population Projections
Data Found At:
http://www.okcommerce.gov/Libraries/Documents/Projections_of_Cities_Towns_in_Oklahoma_2000_121004413.pdf
The download contains population/growth projections from 2000-2030 for Oklahoma.
Information provided is by County, Towns and Cities, Remainder of the County.
Example for the Sasakwa Rural Water District, Seminole County.
Population
Projections
2000
2005
2010
2015
2020
2025
2030
Remainder of County
11,716
11,720
11,860
12,050
12,240
12,380
12,570
Using the compound amount formula F = P(1+r)n
Where F: future amount, P: present amount, r: growth rate, n: term in years
(F/P)1/n-1 = r (12570/11716)1/30-1 = r .002348 = r
From the sdwis.deq.state.ok.us web site the water system site the user population of the RWD is 210 people in 2010.
This project will add an additional 8 homes to the system with an increased population of 27 people.
In twenty years F = 237(1+0.002348)20years = 248 people
Population Growth at Design Life
(Persons)
Present Pop
Year 2010
Pop. added by this project
Total Pop Of this project
Future Pop at design life year 2040
210
27
237
248
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 11
APPENDIX B
Water Use Projections
Projected Water Usage: Average daily calculated water use from 12 months of readings was taken from the master meter in the pumphouse. Using current data, the average daily use per person is:
17850 gpd/210 persons = 85 gallons per capita per day (gpcd)
Adding the new homes served by this project:
85 gpd x 27 persons = 2295 gpd
Using the same formula as population growth at 20 year design life (Appendix A), calculate daily demand at 20 years.
F = (17850 + 2295) gpd x (1+0.002348)20years = 21,112 gpd
Using the same formula as population growth at 20 year design life, calculate increase in homes.
F = (70 + 8) homes x (1+0.002348)20years = 82 homes
Water Usage at Design Life
(gallons per day)
Average Daily Demand
Present
Added users
Total
20 Years
17,850
2,295
20,145
21,112 gpd
Water Usage at Design Life
(gallons per day)
Maximum Daily Demand = 2 X Average Daily Demand
Present
Added users
Total
20 Years
35,700
4,590
40,290
42,224
Water Usage at Design Life
(gallons per hour)
Peak Hourly Demand = 1 gpm per hour x 60 min.
Homes
Added homes
Total homes
Homes at 20 years
20 years
70
8
78
82
4,920 gph
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 12
APPENDIX C
Table of Design Capacity
The following example table shows the design capacity for each proposed facility component based on ODEQ construction standards (OAC 252:626).
EXAMPLE TABLE
Unit
Design Criteria
for Each Unit
Number of Units
ODEQ Requirement
Capacity of Each Unit
Total Firm Capacity
Raw water pumps
520 gpm
3
rated with largest pump out of service
0.75 MGD
1.5 MGD
Rapid mix
3 ft x 3 ft x 3 ft (water depth) (or static in-line mixer)
2
maximum 30 seconds detention time
1.5 MGD
1.5 MGD
Flocculation
6.5 ft x 24 ft x 14 ft
(water depth)
2
minimum 30 minutes detention time
0.75 MGD
1.5 MGD
Sedimentation
24 ft x 50 ft x 14 ft
(water depth)
2
minimum 4 hours detention time
0.75 MGD
1.5 MGD
Filtration
18 ft x 20 ft
dual media
(anthracite, silica sand)
2
maximum 3 gpm/ft2; rated with largest filter out of service
1.5 MGD
1.5 MGD
Disinfection
40 ft x 50 ft x 15 ft
(total depth of clearwell)
1
requirements presented in following Appendix D
1.5 MGD
1.5 MGD
High service pumps
520 gpm
3
rated with largest pump out of service
0.75 MGD
1.5 MGD
Lagoons
Design for periodic removal of residuals so as to maintain residuals at least two feet below the maximum operating level. If wastewater is recycled, design for at least 4 hours settling time of wastewater before recycling at a maximum rate of 10 percent of the total flow entering the plant. (OAC 252:631-3-19 and OAC 252:626-13-4)
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 13
APPENDIX D
Calculation of Capacity of Disinfection Process
Include the following in the report:
􀂃
schematic identifying segments of the treatment system beginning at one disinfectant injection or monitoring point and ending at the next disinfectant injection or monitoring point (The final point must be located before or at the first customer which would be the water plant itself.)
􀂃
schematic of each disinfection segment showing inlet, outlet, baffling, and disinfectant injection and monitoring points
􀂃
calculations showing the design capacity of a surface water treatment plant disinfection process based on ODEQ construction standards (OAC 252:626) and EPA requirements (EPA 815-R-990913 and EPA 816-R-03-004). (Example is provided below.)
The following example presents an approach for evaluating the capacity of the disinfection process based on the use of free chlorine and the inactivation of Giardia lamblia. This example is based on post-disinfection (after the filters) capability only, since prechlorination is not practiced at this plant.
IntakeCoagulationFlocculationSedimentationFiltrationClearwellDistributionSystemChlorineInjectedDisinfection SegmentMonitoring PointCl2residual TemperaturepHDisinfection Segment
Figure: Plant Schematic Showing a Conventional
Water Treatment Plant with One Disinfection Segment
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 14
APPENDIX D
Calculation of Capacity of Disinfection Process
(continued)
1. Determine minimum log inactivation required by disinfection.
Based on raw water quality, a minimum total of 3.0 log inactivation is required for the plant. Allow 2.5 log reduction for the physical processes, because plant is conventional facility in good operating condition. (See table below.)
Type of Filter Plant
Expected Log Removals - Giardia
Conventional
2.5
Membrane
2.5
Package Plant
2.0
Slow Sand
2.0
Log inactivation required by disinfection = 3.0 - 2.5 = 0.5
2. Determine CT (chlorine concentration x time) required for 0.5 log inactivation of Giardia.
Use the following parameters based on plant records:
T = 5.0°C (minimum water temperature)
pH = 7.5 (maximum treated water pH)
free chlorine residual = 1.4 mg/L (targeted minimum residual leaving clearwell)
Using the parameters listed above, look at tables in the following publication to obtain the corresponding CT value: Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources (AWWA, 1991).
CT = 31 mg/L-min
3. Determine required contact time based on minimum free chlorine residual.
Required contact time = (31 mg/L - min) ÷ (1.4 mg/L) = 22 min
4. Determine effective volume of the clearwell (contact basin).
Effective volume is calculated using the minimum operating depth and by taking into account the potential for short-circuiting through use of tracer studies or use of what is called a baffling factor. For this example, use 7 ft as the minimum operating depth. Use 0.3 as a baffling factor since the basin is unbaffled. (For baffling factors, see EPA 815-R-99-013 and EPA 816-R-03-004.)
Effective volume = 70 ft x 70 ft x 7 ft x 7.48 gal/ft3 x 0.3 = 76,969 gal
5. Determine rated capacity.
Rated capacity = (76,969 gal) ÷ (22 min) = (3498 gpm) x (1440 min/day) = 5.0 MGD Revised: 05/12/2011 Engineering Report Guidelines/Water Page 15
APPENDIX E
Cost Effective Present-Worth Analysis Format
Cost Effective Present-Worth Analysis is a tool that compares feasible alternatives:
•
To ensure modesty in cost and design.
•
To compare options and ensure the best choice for both taxpayers and the borrower.
Present Worth (PW) = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value
1.
Determine Discount Rate Factor (i).
•
Use the “real” Federal Discount Rate
􀂾
Appendix C of OMB Circular A-94
•
What is a real rate versus a nominal rate?
􀂾
Nominal includes market inflation
􀂾
Real removes expected inflation
•
The rate is based on a calendar year: www.whitehouse.gov/omb/circulars_a094_a94_appx-c/
Example: The 20 yr real rate is 2.7% for 2010.
2.
Determine Capital Cost. Capital Cost is the estimated construction cost plus any non- construction costs (i.e. land, fees, testing, etc.) for the alternative shown in the Engineering Report.
Example: Total construction costs for a water treatment plant (WTP) rehabilitation are $1,000,000.00. Total non- construction costs are $156,900 (engineering report = $8500; all other engineering fees = $80,400; legal fees = $26,000; environmental information document = $10,000; land = $20,000; geotechnical testing = $12,000). Total capital costs = $1,156,900.
3.
Determine Uniform Series Present Worth O&M. Uniform Series Present Worth O&M is the present worth of the operation and maintenance costs for the alternative. These costs are assumed to be constant for the life of the project.
PW O&M = A [(1 + i) N -1]
PW O&M = present worth of O&M series
i(1 + i) N A = annual O&M value (assumed constant)
i = discount rate
N = number of years in evaluation period
Example: N = 20 years (in most cases), i = 0.027, A = $50,000
PW O&M = A * 15.30 = $50,000 * 15.30 = $765,000
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 16
4.
Determine Salvage Value. Salvage Value is only needed if the useful life is longer than the planning period, otherwise if useful life is equal to the planning period, salvage value is zero.
•
Start with useful life of facility or infrastructure.
•
Assume straight line depreciation and 20 year analysis.
􀂾
salvage value at 20th year = capital cost * (years of service remaining at end of planning horizon / total useful life).
PW salvage value = F (1 + i) –N PW salvage value = present worth of salvage value
F = future salvage value
i = discount rate
N = number of years in evaluation period
Example: N = 20 years (in most cases), i = 0.027
If the WTP has a useful life of 30 years (at 20 years, there is 10 years remaining) and a capital cost of $1,156,900, then F = 1/3 * ($1,156,900) = $385,633.
PW salvage value = $385,633 (1 + 0.027) –20 = $226,342
5.
Present Worth (PW) for each alternative = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value
Example: Therefore, Present Worth (PW) for the alternative = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value = $1,156,900 + $765,000 – $226,342 = $1,695,558
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 17
APPENDIX F
Water Rights Request Form
Please See Next PageRevised: 05/12/2011 Engineering Report Guidelines/Water Page 18
Oklahoma Funding Agency Coordinating Team
Request for Preliminary Confirmation of Water Rights
and/or Authorizations for Dam Infrastructure
Instructions: Please complete and submit this form to:
Permitting Section Head
Oklahoma Water Resources Board
3800 North Classen Blvd.
Oklahoma City, OK 73118
A. ENGINEER/CONTACT FOR APPLICANT SEEKING FUNDING
Name of Person Requesting Confirmation: __________________________________________
Firm/Entity Name: ___________________________________________________________
Mailing Address: _______________________________________________________________
Phone Number: Office: _______________________ Other: ___________________________
Email Address: _______________________________ Fax Number: ____________________
B. INFORMATION ABOUT APPLICANT SEEKING FUNDING
Name of Applicant Requesting Funding: ____________________________________________
Contact Name & Title (if different from above): ______________________________________
Address: ___________________________________________________________________
Phone/Email/Fax: ____________________________________________________________
C. INFORMATION ABOUT FUNDING AGENCY
Funding Agency Name: _________________________________________________________
Funding Agency Contact Person: __________________________________________________
Phone/Email/Fax: ____________________________________________________________
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 19
D. PROJECT DESCRIPTION
Brief Description of Project to be Funded:
E. WATER RIGHTS
(An electronic copy of the water rights may be obtained by contacting the Oklahoma Water Resources Board Permitting Section.)
1. Source(s) of water used by Applicant (check all that apply):
Groundwater ______ Surface/Stream Water _____
2. Does the Applicant purchase some or all of its water from another water supplier(s)?
Yes _______ No ________
If “Yes”, name of water supplier(s):
3. Please list all active water rights held by Applicant (or its water supplier, if water is purchased).
Water Right/
Permit #
Name of Water Right Holder
Authorized Amount (af/yr)
Legal Location of Authorized Wells/Diversion Points
(If additional space is needed, please attach additional page.) Revised: 05/12/2011 Engineering Report Guidelines/Water Page 20
4. Have all legal locations of wells/diversion points being used by the Applicant been field verified?
Yes _______ No ________
5. Do all legal locations match the locations authorized under the water rights listed in item # 3 above?
Yes _______ No ________
6. How were the legal locations verified?
GPS _____ Survey _____ Other ______________________________
If GPS or land survey was conducted, please attach a list of GPS lat/long for each well/diversion point or a copy of the survey showing well locations.
7. If Applicant leases groundwater or lands dedicated for a groundwater permit, have all leases held by the Applicant been verified and found in good standing and on file at the OWRB?
Yes _______ No ________
8. If Applicant’s source water is groundwater, have all well completion reports been filed with the OWRB for all wells being utilized?
Yes _______ No ________
Name of well drilling company(ies) who drilled the existing wells:
F. DAM INFRASTRUCTURE
If no dams are owned or operated by the Applicant seeking funding, please skip this section. (An electronic copy of the State Inventory of Dams Summary may be obtained by contacting the Oklahoma Water Resources Board Dam Safety Program staff.)
1. List All Dams Owned or Operated by Applicant:
NID #
Name of Owner
Name of Dam
Dam Hazard-Potential Classification
(If additional space is needed, please attach additional page.)
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 21
2. All dams are properly maintained and verification has been made that no trees, brush, excessive vegetation or significant erosion on dam embankments or spillways exists.
Yes _______ No ________
If no, please explain:
3. If classified as a “low-hazard” dam, has the area below each dam been reviewed for downstream development in the potential inundation area?
Yes _______ No ________
If no, please explain:
If yes, does downstream development exist?
Yes _______ No ________
If yes, please describe type of development (i.e.: houses, industrial or commercial facilities, etc.):
4. Has each dam classified as a “high-hazard” been inspected by a Professional Engineer during the past year?
Yes _______ No ________
If no, please explain:
5. Has each dam classified as a “significant-hazard” been inspected by a Professional Engineer during the past three years?
Yes _______ No ________
If no, please explain:
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 22
CERTIFICATION
I, __________________________________, on behalf of the Applicant listed, do hereby certify that all information stated herein is true and correct to the best of my knowledge.
_____________________________ ____________________
Signature Date
OWRB Use Only
____Information submitted has been reviewed and compared to the records of the OWRB, water right files, and/or dam infrastructure requirements and all requirements are in good standing.
____Information provided shows deficiencies or inconsistencies in the water rights and/or dam infrastructure requirements.
Description of deficiencies:
Date:
Water Rights Permitting Section Head Signature:
Dam Safety Program Manager Signature:
The OWRB will send a copy of this completed confirmation request to the FACT funding agency, the person or firm submitting the request on behalf of the Applicant, and the Applicant seeking the funding.
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 23
APPENDIX G
Green Project Reserve Components
To be added by DWSRF

Click tabs to swap between content that is broken into logical sections.

GUIDELINES FOR
ENGINEERING REPORTS
FOR
WATER PROJECTS
ENDORSED BY:
OKLAHOMA WATER RESOURCES BOARD
OKLAHOMA DEPARTMENT OF COMMERCE
OKLAHOMA CITY AREA INDIAN HEALTH SERVICE
USDA - RURAL DEVELOPMENT - OKLAHOMA
OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY
Revised: May 12, 2011 Revised: 05/12/2011 Engineering Report Guidelines/Water Page 1
CONTENTS
ENGINEERING REPORT
Water Projects
I. Project Planning Area
A.
Location, maps, photographs, & sketches .................................................. Page 3
B.
Design Period ....................................................................................................... 3
C.
Growth areas and population trends .................................................................... 3
D.
Current and projected water use data ................................................................. 3
E.
Environmental concerns in service area .............................................................. 3
II. Existing Facilities and Need for Project
A. Location and layout ............................................................................................. 3
B. Condition of existing facilities ............................................................................... 3
C. Health and safety ................................................................................................ 3
D. System O&M ....................................................................................................... 4
E. Growth capacity ................................................................................................... 4
F. Sewage system availability .................................................................................. 4
III. Alternatives Considered
A. Description ........................................................................................................... 4
B. Design criteria ...................................................................................................... 4
C. Environmental Impacts ........................................................................................ 4
D. Land requirements .............................................................................................. 5
E. Construction problems ......................................................................................... 5
F. Cost estimates ..................................................................................................... 5
G. Advantages/Disadvantages ................................................................................. 5
IV. Proposed Project Design and Cost Estimate (Recommended Alternative)
A.
Source(s) of water supply .................................................................................... 5
B.
Water rights ......................................................................................................... 6
C.
Treatment ............................................................................................................ 7
D.
Storage ................................................................................................................ 7
E.
Pumping stations ................................................................................................. 7
F.
Distribution layout ................................................................................................ 7
G.
Hydraulic calculations .......................................................................................... 7
H.
Waste disposal .................................................................................................... 7
I.
Green project reserve components ..................................................................... 8
J.
Recommended alternative cost estimate ............................................................. 8
V. Financial status .......................................................................................................... 8
VI. Conclusions and Recommendations ......................................................................... 8
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 2
CONTENTS (continued)
ENGINEERING REPORT
Water Projects
Appendices
Appendix A Population Projections
Appendix B Water Use Projections
Appendix C Table of Design Capacity
Appendix D Calculation of Capacity of Disinfection Process
Appendix E Cost Effective Present-Worth Analysis Format
Appendix F Water Rights Request Form
Appendix G Green Project Reserve ComponentsRevised: 05/12/2011 Engineering Report Guidelines/Water Page 3
ENGINEERING REPORT
Water Projects
I.
PROJECT PLANNING AREA. Describe the area under consideration. The project planning area may be larger than the service area determined to be economically feasible. The description should include information on the following:
A.
Location, maps, photographs, and sketches. These materials should indicate legal and natural boundaries, major obstacles, elevations, etc.
B.
Design Period. Define the design period of the project.
C.
Growth areas and population trends. Specific areas of concentrated growth should be identified. Population projections for the project planning area and concentrated growth areas should be provided for the project design period. These projections should be based on historical records with justification from recognized sources such as U.S. Census Bureau and Department of Commerce. If additional sources are utilized, provide additional documentation and justification. (See example table in Appendix A.) Include a description of population trends as indicated by available records, and the estimated population that will be served by the proposed water supply system or expanded system.
C.
Current and projected water use data. For existing systems, the current water use data should be used as a basis for the proposed design. If a deviation is deemed necessary, a justification must be provided. Present water consumption and the projected average maximum daily demands, and peak hourly flow shall be used as the basis of design. (See example table in Appendix B.)
D.
Environmental concerns in the service area. Discuss all the environmental concerns or effects within the service area that must be considered in project planning.
II. EXISTING FACILITIES AND NEED FOR PROJECT. Describe the existing facilities including at least the following information:
A. Location and layout. Provide a site plan and schematic layout for treatment facilities.
B. Condition of existing facilities. Describe present condition, suitability for continued use, adequacy of water supply, existing water source quantity (yield or specific capacity) and quality. Describe compliance with all state and federal requirements for water supply systems including primary and secondary drinking water standards, and National Pollutant Discharge Elimination System permits. Discuss the wastes generated by existing water treatment processes, their volume, treatment, and points of discharge or method of disposal. Provide table showing the design capacity for each existing facility component based on ODEQ Revised: 05/12/2011 Engineering Report Guidelines/Water Page 4
construction standards (OAC 252:626). (See example tables in Appendix C and D.)
C. Health and safety. Describe concerns and include relevant regulations and correspondence from/to Federal and State regulatory agencies such as ODEQ inspection reports, Notices of Violation, and Consent or Administrative Orders. Also, describe compliance with all state and federal requirements for water supply systems pertaining to handicap accessibility standards for public areas such as the office, and security standards for protection of all drinking water facilities. This section should also discuss any improvements necessary to provide enhanced security at source or treatment facilities and improved handicap accessibility in public use areas as required by the Americans with Disabilities Act.
D. System O&M. Describe the concerns and indicate those with the greatest impact. Investigate water loss, management adequacy, inefficient designs, outdated facilities and problem elimination prior to adding additional capacity.
E. Growth capacity. Describe the reasonable growth capacity that is necessary to meet needs during the planning period. Facilities proposed to be constructed to meet future growth needs should generally be supported by additional revenues. Consideration should be given to designing for phased capacity increases. Provide number of new customers committed to this project.
F. Sewage system availability. Describe the existing sewage system, sewage treatment works, and water treatment plant sewage system for both treatment and sanitary wastes. For new water systems or water distribution extension projects, describe the existing or proposed sewage system for the new service area. Water treatment plant engineering reports must provide an approvable sewage disposal system. Discuss proper separation of water and sewage facilities.
III. ALTERNATIVES CONSIDERED. This section should contain a description of the reasonable alternatives, including the do-nothing alternative wherever applicable, that were considered in planning a solution to meet the identified need. The description should include the following information on each alternative:
A. Description. Describe the facilities associated with the alternative. Describe all feasible water supply sources and provide comparison of such sources. Also, describe treatment, storage, pumping, distribution facilities, discharge point and receiving water body, as applicable.
B. Design criteria. State the design parameters used for evaluation purposes at average daily flow, max daily flow and peak hourly flow. Also, include parameters such as contact time, detention time, size of units.
C.
Environmental impacts. Provide a short description of environmental impacts Revised: 05/12/2011 Engineering Report Guidelines/Water Page 5
that may preclude any alternatives. Only projects that will utilize funds that have a federal identity require the completion of an Environmental Information Document (EID). Those current funding sources would be as follows:
1. Rural Development Loan and Grant Programs for Water and Wastewater
2. Department of Commerce Community Development Block Grants
3. OWRB-ODEQ State Revolving Loan Funds
4. Oklahoma City Area Indian Health Service
D.
Land requirements. Identify sites, rights-of-way and easements required. Further specify whether these properties are currently owned, to be acquired or leased.
E.
Construction problems. Discuss concerns such as subsurface rock, unsuitable materials, high water table, limited access, flood plain areas, or other conditions which may affect cost of construction or operation of facility.
F.
Cost estimates.
1.
Construction.
2. Non-construction and other projects costs such as land, professional fees, testing, surveying, etc.
3. Annual operation and maintenance.
4. Cost effective present worth analysis. See a sample format in Appendix E.
G. Advantages/Disadvantages. Describe the specific alternative’s ability to meet the owner's needs within its financial and operational resources, comply with regulatory requirements, compatibility with existing comprehensive area-wide development plans, and satisfy public and environmental concerns.
IV. PROPOSED PROJECT DESIGN AND COST ESTIMATE (RECOMMENDED ALTERNATIVE). This section should contain a fully developed description of the proposed project based on the preliminary description under the evaluation of alternatives. At least the following information should be included:
A.
Source(s) of water supply. The applicant should describe the proposed source or sources of water supply to be developed, the reasons for their selection, and provide the following information:
1.
For surface water sources, include:
a.
hydrologic data, stream flow and weather records.
b.
safe yield, quantity, including all factors that may affect it.
c.
maximum flood or pool elevation.
d.
description of the watershed, noting any existing or potential sources of contamination which may affect water quality.
e.
summary of the quality of raw water with special reference to fluctuations in quality. Revised: 05/12/2011 Engineering Report Guidelines/Water Page 6
2.
For ground water sources, include:
a.
sites considered.
b.
advantages of the site selected.
c.
elevations with respect to surroundings and floodplain(s).
d.
character of formations through which the source is to be developed.
e.
geologic conditions affecting the site.
f.
summary of source exploration, test well depth, and method of construction; placement of liners or screen; test pumping rates and their duration; water levels and specific capacity, chemical and radiological quality of the water.
g.
all sources of possible contamination including but not limited to sewers and sewerage facilities, landfills, outcroppings of consolidated water bearing formations, waste disposal wells, slush pits, irrigation wells, and abandoned wells.
h.
industrial and other private supply. Where pertinent, use significant groundwater developments within a one mile (1.6 kilometer) radius of the proposed groundwater source, giving depths, size, protective casing depth, capacity, location, type and any available information pertaining thereto.
3.
For purchased water systems, include:
a.
Quantity available from source water systems.
b.
Quality of source water system.
c.
Copy of the Purchase Water Contract
B.
Water rights. Existing and proposed (Discuss the status of any water rights acquisition(s)). Send water rights inquiry form to appropriate agency. (See Appendix F for form.) Verify that the amount of water rights held is sufficient to supply enough water for current and possible future use.
1.
Verification that the water rights held at the Oklahoma Water Resources Board are in good standing and not subject to cancellation or reduction. This verification may be obtained by contacting the Permitting Section of the Oklahoma Water Resources Board. Verify that all wells and/or diversion points being utilized are authorized under water rights held at the Oklahoma Water Resources Board. Verification shall include the submittal of the GPS locations or land survey of all wells and/or diversion point locations along with the legal location of each down to a 10-acre tract. Verification form must be submitted certifying that the locations have been compared with the legal locations authorized under such water rights and that all wells and/or diversion points being utilized are authorized under the permits held at the Oklahoma Water Resources Board. Any new wells and/or diversion points being proposed must be permitted by the Oklahoma Water Resources Board (process for permitting may take as little as three months if application is not protested and up to a year or longer if protested). Revised: 05/12/2011 Engineering Report Guidelines/Water Page 7
2.
If the authorized raw water use is or will be from an Army Corps of Engineers reservoir, verification that the water storage contract with the Army Corps of Engineers provides adequate storage for the term of the loan of the appropriate funding agency.
3.
If the authorized raw water use is or will be from a Grand River Dam Authority reservoir, verification that the raw water supply contract with the Grand River Dam Authority provides adequate storage for the term of the loan of the appropriate funding agency.
C.
Treatment. Describe process in detail including a plan view and schematic of site layout, and identify location of plant and site of any process discharges. Also describe foundation conditions and floodplain elevations at sites of proposed structure based on geotechnical information, and approximate elevation of groundwater in relation to subsurface structures. Provide a hydraulic profile of treatment facilities. In a table, show the design capacity for each existing unit, proposed unit, ODEQ required capacity (OAC 252:626), and indicate if plant design meets ODEQ requirement. See appendices C and D for example tables of plant design and disinfection process capacity. Provide a description of how water treatment plant sludge is or will be managed and a status of an ODEQ approved sludge management plan. Provide a description of back-up and/or alternate power supply.
D.
Storage. Identify size, type and site location. Discuss hydraulic interactions with existing facilities. Also describe foundation conditions and floodplain elevations at sites of proposed structure based on geotechnical information, and approximate elevation of groundwater in relation to subsurface structures.
E.
Pumping stations. Identify size, type, site location and any special power requirements.
F.
Distribution layout. Identify general location of line improvements: lengths, sizes and key components, and the character of the soil through which water mains are to be installed including NRCS soil maps and descriptions.
G.
Hydraulic calculations. This information should provide sufficient detail in a tabular format to determine compliance with ODEQ design requirements. Automation tools may be used by the engineer. The submittal should include a map with a list of nodes and pipes and the associated characteristics, such as elevation of node, pipe diameter, pipe segment length, reservoir elevation, domestic and industrial peak water demands, pressures, fire flow, etc. Describe fire flows which will be made available by the proposed or enlarged system. Requirements of the Insurance Services Office or other similar agency as to the fire flows required or recommended in the service area involved.
H.
Waste disposal. Discuss the various wastes including residuals from the water treatment plant, their volume, proposed treatment, points of discharge, discharge Revised: 05/12/2011 Engineering Report Guidelines/Water Page 8
permit required and/or method of disposal. A ODEQ approved residuals management plan will be required with construction permit. Project sites shall include the following:
1.
Discussion of the various sites considered and advantages of the recommended ones.
2.
The proximity of residences, industries, and other establishments.
3.
Any potential sources of pollution that may influence the quality of the supply or interfere with effective operation of the water works system, including but not limited to: absorption systems, septic tanks, privies, cesspools, sink holes, sanitary landfills, refuse and garbage dumps.
4.
Provide geotechnical results for lagoons.
I.
Green project reserve components (for SRF Projects Only). Identify and discuss any components of the proposed project that may qualify as “green” based on the guideline in Appendix G. Complete and attach the GPR check sheet as an appendix to the Engineering Report.
J.
Recommended Alternative Cost Estimate. Provide an itemized cost estimate for the proposed project based upon anticipated period of construction (For projects containing both water and waste disposal systems, provide a separate cost estimate for each system.)
1.
Development costs.
2.
Construction costs.
3.
Land and rights.
4.
Legal fees.
5.
Engineering fees.
6.
Inspection fees.
7.
Interest.
8.
Contingency.
9.
Refinancing.
10.
Other costs associated with the proposed project.
V. Financial status. Provide information regarding:
A.
The current and proposed or projected rate schedules.
B.
Annual operating and maintenance (O&M) cost (existing and proposed).
C.
Tabulation of users by monthly usage categories.
D.
Revenue received for the last three fiscal years.
E.
Give status of existing debts and required reserve accounts.
F.
Prepare a schedule of short-lived assets and a recommended annual reserve deposit to fund replacement of short-lived assets such as pumps, paint, and small equipment. Short-lived assets include those items not covered under O&M, however, this does not include long-lived assets such as water tank or treatment facility replacement that should be funded with long-term financing.
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 9
VI. Conclusions and Recommendations. Provide any additional findings and recommendations that should be considered in development of the project. This may include recommendations for special studies; highlight the need for special coordination, a recommended plan of action to expedite project development, etc. Provide a schedule for the project planning and construction.
END OF GUIDELINES
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 10
APPENDIX A
Population Projections
Data Found At:
http://www.okcommerce.gov/Libraries/Documents/Projections_of_Cities_Towns_in_Oklahoma_2000_121004413.pdf
The download contains population/growth projections from 2000-2030 for Oklahoma.
Information provided is by County, Towns and Cities, Remainder of the County.
Example for the Sasakwa Rural Water District, Seminole County.
Population
Projections
2000
2005
2010
2015
2020
2025
2030
Remainder of County
11,716
11,720
11,860
12,050
12,240
12,380
12,570
Using the compound amount formula F = P(1+r)n
Where F: future amount, P: present amount, r: growth rate, n: term in years
(F/P)1/n-1 = r (12570/11716)1/30-1 = r .002348 = r
From the sdwis.deq.state.ok.us web site the water system site the user population of the RWD is 210 people in 2010.
This project will add an additional 8 homes to the system with an increased population of 27 people.
In twenty years F = 237(1+0.002348)20years = 248 people
Population Growth at Design Life
(Persons)
Present Pop
Year 2010
Pop. added by this project
Total Pop Of this project
Future Pop at design life year 2040
210
27
237
248
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 11
APPENDIX B
Water Use Projections
Projected Water Usage: Average daily calculated water use from 12 months of readings was taken from the master meter in the pumphouse. Using current data, the average daily use per person is:
17850 gpd/210 persons = 85 gallons per capita per day (gpcd)
Adding the new homes served by this project:
85 gpd x 27 persons = 2295 gpd
Using the same formula as population growth at 20 year design life (Appendix A), calculate daily demand at 20 years.
F = (17850 + 2295) gpd x (1+0.002348)20years = 21,112 gpd
Using the same formula as population growth at 20 year design life, calculate increase in homes.
F = (70 + 8) homes x (1+0.002348)20years = 82 homes
Water Usage at Design Life
(gallons per day)
Average Daily Demand
Present
Added users
Total
20 Years
17,850
2,295
20,145
21,112 gpd
Water Usage at Design Life
(gallons per day)
Maximum Daily Demand = 2 X Average Daily Demand
Present
Added users
Total
20 Years
35,700
4,590
40,290
42,224
Water Usage at Design Life
(gallons per hour)
Peak Hourly Demand = 1 gpm per hour x 60 min.
Homes
Added homes
Total homes
Homes at 20 years
20 years
70
8
78
82
4,920 gph
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 12
APPENDIX C
Table of Design Capacity
The following example table shows the design capacity for each proposed facility component based on ODEQ construction standards (OAC 252:626).
EXAMPLE TABLE
Unit
Design Criteria
for Each Unit
Number of Units
ODEQ Requirement
Capacity of Each Unit
Total Firm Capacity
Raw water pumps
520 gpm
3
rated with largest pump out of service
0.75 MGD
1.5 MGD
Rapid mix
3 ft x 3 ft x 3 ft (water depth) (or static in-line mixer)
2
maximum 30 seconds detention time
1.5 MGD
1.5 MGD
Flocculation
6.5 ft x 24 ft x 14 ft
(water depth)
2
minimum 30 minutes detention time
0.75 MGD
1.5 MGD
Sedimentation
24 ft x 50 ft x 14 ft
(water depth)
2
minimum 4 hours detention time
0.75 MGD
1.5 MGD
Filtration
18 ft x 20 ft
dual media
(anthracite, silica sand)
2
maximum 3 gpm/ft2; rated with largest filter out of service
1.5 MGD
1.5 MGD
Disinfection
40 ft x 50 ft x 15 ft
(total depth of clearwell)
1
requirements presented in following Appendix D
1.5 MGD
1.5 MGD
High service pumps
520 gpm
3
rated with largest pump out of service
0.75 MGD
1.5 MGD
Lagoons
Design for periodic removal of residuals so as to maintain residuals at least two feet below the maximum operating level. If wastewater is recycled, design for at least 4 hours settling time of wastewater before recycling at a maximum rate of 10 percent of the total flow entering the plant. (OAC 252:631-3-19 and OAC 252:626-13-4)
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 13
APPENDIX D
Calculation of Capacity of Disinfection Process
Include the following in the report:
􀂃
schematic identifying segments of the treatment system beginning at one disinfectant injection or monitoring point and ending at the next disinfectant injection or monitoring point (The final point must be located before or at the first customer which would be the water plant itself.)
􀂃
schematic of each disinfection segment showing inlet, outlet, baffling, and disinfectant injection and monitoring points
􀂃
calculations showing the design capacity of a surface water treatment plant disinfection process based on ODEQ construction standards (OAC 252:626) and EPA requirements (EPA 815-R-990913 and EPA 816-R-03-004). (Example is provided below.)
The following example presents an approach for evaluating the capacity of the disinfection process based on the use of free chlorine and the inactivation of Giardia lamblia. This example is based on post-disinfection (after the filters) capability only, since prechlorination is not practiced at this plant.
IntakeCoagulationFlocculationSedimentationFiltrationClearwellDistributionSystemChlorineInjectedDisinfection SegmentMonitoring PointCl2residual TemperaturepHDisinfection Segment
Figure: Plant Schematic Showing a Conventional
Water Treatment Plant with One Disinfection Segment
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 14
APPENDIX D
Calculation of Capacity of Disinfection Process
(continued)
1. Determine minimum log inactivation required by disinfection.
Based on raw water quality, a minimum total of 3.0 log inactivation is required for the plant. Allow 2.5 log reduction for the physical processes, because plant is conventional facility in good operating condition. (See table below.)
Type of Filter Plant
Expected Log Removals - Giardia
Conventional
2.5
Membrane
2.5
Package Plant
2.0
Slow Sand
2.0
Log inactivation required by disinfection = 3.0 - 2.5 = 0.5
2. Determine CT (chlorine concentration x time) required for 0.5 log inactivation of Giardia.
Use the following parameters based on plant records:
T = 5.0°C (minimum water temperature)
pH = 7.5 (maximum treated water pH)
free chlorine residual = 1.4 mg/L (targeted minimum residual leaving clearwell)
Using the parameters listed above, look at tables in the following publication to obtain the corresponding CT value: Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources (AWWA, 1991).
CT = 31 mg/L-min
3. Determine required contact time based on minimum free chlorine residual.
Required contact time = (31 mg/L - min) ÷ (1.4 mg/L) = 22 min
4. Determine effective volume of the clearwell (contact basin).
Effective volume is calculated using the minimum operating depth and by taking into account the potential for short-circuiting through use of tracer studies or use of what is called a baffling factor. For this example, use 7 ft as the minimum operating depth. Use 0.3 as a baffling factor since the basin is unbaffled. (For baffling factors, see EPA 815-R-99-013 and EPA 816-R-03-004.)
Effective volume = 70 ft x 70 ft x 7 ft x 7.48 gal/ft3 x 0.3 = 76,969 gal
5. Determine rated capacity.
Rated capacity = (76,969 gal) ÷ (22 min) = (3498 gpm) x (1440 min/day) = 5.0 MGD Revised: 05/12/2011 Engineering Report Guidelines/Water Page 15
APPENDIX E
Cost Effective Present-Worth Analysis Format
Cost Effective Present-Worth Analysis is a tool that compares feasible alternatives:
•
To ensure modesty in cost and design.
•
To compare options and ensure the best choice for both taxpayers and the borrower.
Present Worth (PW) = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value
1.
Determine Discount Rate Factor (i).
•
Use the “real” Federal Discount Rate
􀂾
Appendix C of OMB Circular A-94
•
What is a real rate versus a nominal rate?
􀂾
Nominal includes market inflation
􀂾
Real removes expected inflation
•
The rate is based on a calendar year: www.whitehouse.gov/omb/circulars_a094_a94_appx-c/
Example: The 20 yr real rate is 2.7% for 2010.
2.
Determine Capital Cost. Capital Cost is the estimated construction cost plus any non- construction costs (i.e. land, fees, testing, etc.) for the alternative shown in the Engineering Report.
Example: Total construction costs for a water treatment plant (WTP) rehabilitation are $1,000,000.00. Total non- construction costs are $156,900 (engineering report = $8500; all other engineering fees = $80,400; legal fees = $26,000; environmental information document = $10,000; land = $20,000; geotechnical testing = $12,000). Total capital costs = $1,156,900.
3.
Determine Uniform Series Present Worth O&M. Uniform Series Present Worth O&M is the present worth of the operation and maintenance costs for the alternative. These costs are assumed to be constant for the life of the project.
PW O&M = A [(1 + i) N -1]
PW O&M = present worth of O&M series
i(1 + i) N A = annual O&M value (assumed constant)
i = discount rate
N = number of years in evaluation period
Example: N = 20 years (in most cases), i = 0.027, A = $50,000
PW O&M = A * 15.30 = $50,000 * 15.30 = $765,000
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 16
4.
Determine Salvage Value. Salvage Value is only needed if the useful life is longer than the planning period, otherwise if useful life is equal to the planning period, salvage value is zero.
•
Start with useful life of facility or infrastructure.
•
Assume straight line depreciation and 20 year analysis.
􀂾
salvage value at 20th year = capital cost * (years of service remaining at end of planning horizon / total useful life).
PW salvage value = F (1 + i) –N PW salvage value = present worth of salvage value
F = future salvage value
i = discount rate
N = number of years in evaluation period
Example: N = 20 years (in most cases), i = 0.027
If the WTP has a useful life of 30 years (at 20 years, there is 10 years remaining) and a capital cost of $1,156,900, then F = 1/3 * ($1,156,900) = $385,633.
PW salvage value = $385,633 (1 + 0.027) –20 = $226,342
5.
Present Worth (PW) for each alternative = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value
Example: Therefore, Present Worth (PW) for the alternative = [Capital Cost] + [Uniform Series Present Worth]O&M – [Single Payment Present Worth]Salvage Value = $1,156,900 + $765,000 – $226,342 = $1,695,558
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 17
APPENDIX F
Water Rights Request Form
Please See Next PageRevised: 05/12/2011 Engineering Report Guidelines/Water Page 18
Oklahoma Funding Agency Coordinating Team
Request for Preliminary Confirmation of Water Rights
and/or Authorizations for Dam Infrastructure
Instructions: Please complete and submit this form to:
Permitting Section Head
Oklahoma Water Resources Board
3800 North Classen Blvd.
Oklahoma City, OK 73118
A. ENGINEER/CONTACT FOR APPLICANT SEEKING FUNDING
Name of Person Requesting Confirmation: __________________________________________
Firm/Entity Name: ___________________________________________________________
Mailing Address: _______________________________________________________________
Phone Number: Office: _______________________ Other: ___________________________
Email Address: _______________________________ Fax Number: ____________________
B. INFORMATION ABOUT APPLICANT SEEKING FUNDING
Name of Applicant Requesting Funding: ____________________________________________
Contact Name & Title (if different from above): ______________________________________
Address: ___________________________________________________________________
Phone/Email/Fax: ____________________________________________________________
C. INFORMATION ABOUT FUNDING AGENCY
Funding Agency Name: _________________________________________________________
Funding Agency Contact Person: __________________________________________________
Phone/Email/Fax: ____________________________________________________________
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 19
D. PROJECT DESCRIPTION
Brief Description of Project to be Funded:
E. WATER RIGHTS
(An electronic copy of the water rights may be obtained by contacting the Oklahoma Water Resources Board Permitting Section.)
1. Source(s) of water used by Applicant (check all that apply):
Groundwater ______ Surface/Stream Water _____
2. Does the Applicant purchase some or all of its water from another water supplier(s)?
Yes _______ No ________
If “Yes”, name of water supplier(s):
3. Please list all active water rights held by Applicant (or its water supplier, if water is purchased).
Water Right/
Permit #
Name of Water Right Holder
Authorized Amount (af/yr)
Legal Location of Authorized Wells/Diversion Points
(If additional space is needed, please attach additional page.) Revised: 05/12/2011 Engineering Report Guidelines/Water Page 20
4. Have all legal locations of wells/diversion points being used by the Applicant been field verified?
Yes _______ No ________
5. Do all legal locations match the locations authorized under the water rights listed in item # 3 above?
Yes _______ No ________
6. How were the legal locations verified?
GPS _____ Survey _____ Other ______________________________
If GPS or land survey was conducted, please attach a list of GPS lat/long for each well/diversion point or a copy of the survey showing well locations.
7. If Applicant leases groundwater or lands dedicated for a groundwater permit, have all leases held by the Applicant been verified and found in good standing and on file at the OWRB?
Yes _______ No ________
8. If Applicant’s source water is groundwater, have all well completion reports been filed with the OWRB for all wells being utilized?
Yes _______ No ________
Name of well drilling company(ies) who drilled the existing wells:
F. DAM INFRASTRUCTURE
If no dams are owned or operated by the Applicant seeking funding, please skip this section. (An electronic copy of the State Inventory of Dams Summary may be obtained by contacting the Oklahoma Water Resources Board Dam Safety Program staff.)
1. List All Dams Owned or Operated by Applicant:
NID #
Name of Owner
Name of Dam
Dam Hazard-Potential Classification
(If additional space is needed, please attach additional page.)
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 21
2. All dams are properly maintained and verification has been made that no trees, brush, excessive vegetation or significant erosion on dam embankments or spillways exists.
Yes _______ No ________
If no, please explain:
3. If classified as a “low-hazard” dam, has the area below each dam been reviewed for downstream development in the potential inundation area?
Yes _______ No ________
If no, please explain:
If yes, does downstream development exist?
Yes _______ No ________
If yes, please describe type of development (i.e.: houses, industrial or commercial facilities, etc.):
4. Has each dam classified as a “high-hazard” been inspected by a Professional Engineer during the past year?
Yes _______ No ________
If no, please explain:
5. Has each dam classified as a “significant-hazard” been inspected by a Professional Engineer during the past three years?
Yes _______ No ________
If no, please explain:
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 22
CERTIFICATION
I, __________________________________, on behalf of the Applicant listed, do hereby certify that all information stated herein is true and correct to the best of my knowledge.
_____________________________ ____________________
Signature Date
OWRB Use Only
____Information submitted has been reviewed and compared to the records of the OWRB, water right files, and/or dam infrastructure requirements and all requirements are in good standing.
____Information provided shows deficiencies or inconsistencies in the water rights and/or dam infrastructure requirements.
Description of deficiencies:
Date:
Water Rights Permitting Section Head Signature:
Dam Safety Program Manager Signature:
The OWRB will send a copy of this completed confirmation request to the FACT funding agency, the person or firm submitting the request on behalf of the Applicant, and the Applicant seeking the funding.
Revised: 05/12/2011 Engineering Report Guidelines/Water Page 23
APPENDIX G
Green Project Reserve Components
To be added by DWSRF